5. a picture x feet high is placed on a wall with its base y feet above the level of the eye of an observer. if the observer is z feet from the wall and Q is the radian measure of the angle subtended at the observer's eye by the picture, show that

Since 5x and x has the same sinuse, they have to do with the formulas:
5x=k.360+x
5x=k.360+(180-x)
All the solutions of this equation are given by the formulas:
4x=k.360 --- x=k.90
6x=k.360+180--- x= k.60+30